Leak Detection in Atherton, CA β Find It Before You Open a Wall
The difference between a $300 pipe repair and a $3,000 drywall-and-remediation project is often just whether the leak was found before or after excessive wall opening. Our Leak Detection service in Atherton uses the same detection methods utilities and insurance adjusters rely on β to pinpoint the failure location before anything is cut.
A pressure test tells us a leak exists and how much water is escaping. Detection equipment tells us precisely where.
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Acoustic Ground Microphone
Acoustic detection is most effective on metal pipe (copper, cast iron) under slab or in concrete β materials that conduct sound efficiently. It works in quiet environments and requires shutting off the house briefly to establish a clean acoustic baseline.
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Infrared Thermal Camera
Thermal imaging is particularly effective inside insulated wall cavities and for finding the extent of moisture spread beyond the immediate leak point. It tells us not just where the pipe is failing but how far the moisture has already traveled.
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Pressure Decay Testing
We isolate the supply system, pressurize it to operating pressure, and monitor pressure over a timed hold period. Any pressure drop confirms active water loss from the supply side. By isolating zones β hot side vs. cold side, section by section β we narrow down which branch of the supply system is leaking before the detection phase begins.
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Tracer Gas Detection
For leaks that don't produce sufficient acoustic signature β very slow leaks, polyethylene pipe, or leaks deep under concrete β we can introduce a nitrogen/hydrogen tracer gas mixture into the isolated pipe and use a calibrated gas detector at the surface to find where the gas escapes. The detection sensitivity can locate leaks that produce no discernible pressure drop during a standard timed test.
What We Locate
Hidden Leak Types We Find and Document
Hidden leaks occur in different locations throughout a property β each requiring a slightly different detection approach. Here's how we handle the most common scenarios in Atherton, CA.
Under Slab
Slab Leak Detection
Confirmed slab leak location is documented with a marked point on the floor and provided to you in the written detection report, with coordinates relative to fixed reference points for the repair crew.
In-Wall
In-Wall & Ceiling Leak Detection
Wall and ceiling leaks are often traced by following a visible stain to its apparent high point β but the visible damage can be several feet from the actual pipe failure due to how water travels down framing members. Thermal imaging reveals the wet zone accurately, and acoustic equipment confirms the pipe location within the wall cavity.
Water Main
Underground Supply Line Detection
Supply lines between the meter and the structure run underground and are vulnerable to corrosion, ground movement, and tree root damage. A main supply line leak shows as unusually high meter usage with all interior fixtures off, sometimes with wet ground or sinkholes along the line path. Acoustic detection locates the failure in the buried line precisely enough to minimize excavation footprint.
Pool & Irrigation
Pool Line & Irrigation Leak Detection
Irrigation system leaks in main supply lines and lateral runs are found by isolating zones with the irrigation controller and pressure-testing each zone individually. Zone by zone testing narrows the failure to the smallest possible section.
Commercial
Commercial Property Leak Detection
Commercial water loss from undetected leaks often shows up as elevated utility bills for months before physical evidence appears. We can assess a commercial building's plumbing system for suspected leaks at the property owner's or property manager's request.
Documentation
Leak Detection Report for Insurance
We format detection reports specifically for insurance submission and can provide documentation on our detection equipment and methodology to claims adjusters on request.
From Water Bill Spike to Confirmed Leak Location β 4 Steps
Here's exactly how a Masters Plumbing Service leak detection call plays out.
1
Initial Water Loss Confirmation
This step confirms we're looking for a real leak rather than meter error or a normal appliance cycling.
2
Zone Isolation & Pressure Decay
Zone isolation is the step that turns "there's a leak somewhere in the house" into "the leak is on the hot side supply, between the water heater and the master bath."
3
Detection Equipment Deployment
Within the isolated zone, we deploy thermal imaging first β scanning walls, floors, and ceilings for moisture anomalies. Then acoustic equipment confirms the specific pipe location and narrows it to the tightest possible point. Tracer gas is added if acoustic results aren't conclusive.
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Written Report & Repair Options
You receive a written detection report including pressure test results, detection method summary, leak location (described relative to fixed reference points), and thermal imagery. If you want us to repair the leak, we quote the repair and execute immediately. If you have your own plumber, the report gives them everything they need.
Customer Reviews
Atherton, CA Homeowners Who Found Their Leak with Masters Plumbing Service
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My water bill doubled over three months with no change in usage. Masters Plumbing Service came out, confirmed the meter was moving with everything off, isolated the cold supply to the kitchen as the failing branch, and used the acoustic device on the slab to pinpoint a location 4 feet from the outside wall under the kitchen floor. The repair crew opened a 10-inch circle in the tile, found a pinhole in a copper elbow exactly where detection said it would be. I was skeptical acoustic detection was that precise β it was.
β C. Thornton, Atherton
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Our insurance company required professional leak detection documentation before approving the claim. Masters Plumbing Service's written report with pressure test data and thermal imagery was exactly what the adjuster needed. Claim approved. The detection cost was covered as part of the claim.
β B. Osei, Atherton, CA
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Pool was losing 2 inches of water per day β more than evaporation could explain. Masters Plumbing Service pressure-tested the plumbing circuit, isolated the issue to the return line, and ran acoustic detection along the line path to find the failure at a union fitting under the decking. Repair required pulling one deck board instead of the exploratory digging another company had proposed. Excellent, focused work.
β T. Anand, Atherton, CA
Common Questions
FAQ β What to Know Before Booking Detection
The most reliable self-check: shut off every fixture and appliance in the house, then watch the water meter for 15 minutes. Any movement β including the small leak indicator dial β means water is escaping the supply side somewhere. If the main meter dial moves with everything off, you have a leak. Call us to locate it.
The repair itself requires physical pipe access, which typically means a small, targeted opening. But that's a completely different proposition from opening large wall sections while searching for an unknown leak location.
For pressurized supply lines in concrete or metal pipe, acoustic detection is typically accurate to within 6β18 inches under ideal conditions β quiet environment, no interference from other water use, metal pipe conducting sound clearly. Thermal imaging is accurate to the size of the wet zone it reveals, which varies based on how long the leak has been running and how far moisture has migrated.
We can provide supplemental information to claims adjusters on request, including equipment calibration records and a technical description of the detection methodology used.
A standard residential leak detection β confirming water loss, isolating the failing zone, and deploying detection equipment to locate the failure β typically takes 1.5β2.5 hours. More complex scenarios (multi-zone commercial, large properties, very slow leaks requiring tracer gas) can run 3β4 hours.
The repair quote is given before any wall or floor is opened. You know the full cost of detection + repair before anything is cut.
Service Area
Leak Detection Available Across Atherton, CA
Our detection technicians are equipped with acoustic, thermal, and tracer gas tools for the full range of leak scenarios found in Atherton, CA homes and commercial properties.
High Water Bill or Mystery Stain in Atherton, CA? Find the Source β Call Masters Plumbing Service
Masters Plumbing Service's detection team finds hidden leaks in Atherton homes and commercial properties using equipment that eliminates guesswork. The detection appointment pays for itself the moment it prevents one unnecessary wall opening.
